Fastener



FIG. 1 is a top view of a fastener showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is a side view opposite that shown in FIG. 3;

FIG. 5 is a bottom view thereof;

FIG. 6 is a rear view thereof;

FIG. 7 is an inverted bottom perspective view thereof; and,

FIG. 8 is a top perspective view thereof. 

The ornamental design for a fastener, as shown and described. 